64744628256 has 432 divisors, whose sum is σ = 235779774048. Its totient is φ = 16663449600.

The previous prime is 64744628233. The next prime is 64744628359. The reversal of 64744628256 is 65282644746.

It is a happy number.

64744628256 is a `hidden beast` number, since 6 + 4 + 7 + 4 + 4 + 628 + 2 + 5 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 17539371 + ... + 17543061.

It is an arithmetic number, because the mean of its divisors is an integer number (545786514).

Almost surely, 2^64744628256 is an apocalyptic number.

64744628256 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64744628256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117889887024).

64744628256 is an abundant number, since it is smaller than the sum of its proper divisors (171035145792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64744628256 is a wasteful number, since it uses less digits than its factorization.

64744628256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3845 (or 3827 counting only the distinct ones).

The product of its digits is 15482880, while the sum is 54.

The spelling of 64744628256 in words is "sixty-four billion, seven hundred forty-four million, six hundred twenty-eight thousand, two hundred fifty-six".